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Not to be confused with Shock Site Reaction Videos
Reaction videos are videos posted in forums typically as a response to the OP.
They are usually short sentences or phrases taken from a larger video (popular movies, tv shows, YouTube videos, etc.) that express emotion in a similar fashion to reaction faces.
Notable Reaction Videos
A notable reaction video that has spawned a series of similar videos is Nope.avi
Another notable video called Shut the F*ck up! has been remixed numerous times.